 
document.onscroll = function(){  
    if(document.documentElement.scrollTop>110){
		var d = document.getElementById("nav-holder");
		d.style.background = "#212121";
	}else{
		var d1 = document.getElementById("nav-holder");
		var d2 = document.getElementById("nav-holder");
		d1.style.background = "none";
		d2.color="eee";
	}

	
}  
